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Chapter 15 Birds and Mammals

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carnivore
animal that eats only other animals or the remains of animals
contour feather
strong, lightweight feathers that give their birds their coloring and shape and that are used for flight
down feather
soft, fluffy feathers that provide an insulating layer next to the skin of adult birds and that cover the body of younger birds
endotherm
vertebrate animal with a constant internal temperature
gestation period
period of which an embryo develops in the uterus
herbivore
animal that eats only plants or parts of plants
mammal
endothermic vertebrates that have hair, teeth specialized for eating certain foods, and whose females have mammary glands
mammary gland
milk producing glands of female mammals used to feed their young
marsupial
a mammal with an external pouch for the development of its young
monotreme
mammals that lay eggs with leathery shells
omnivore
animal that eats both plants and animals
placenta
sac-like organ in which a placental embryo develops
placental
a mammal whose offspring develops in a female uterus
preening
when a bird rubs oil from an oil gland to its wings to condition them
umbilical chord
connects the embryo to the placenta moves food and oxygen to the embryo and then removes its wastes